Detachable point and fastening for grain-drill teeth



W. H. -WILSON. Detachable Point and Fastening for Grain-Drill Teeth.

Patented Mar. .16, 1880.

INVENTOR 7%; KO. mm/

flux ATTORNEYS.

WITNESSES. #76. keg/47:

UNITED STATES PATENT OFFICE.

WILLIAM H. WILSON, OF XENIA, OHIO.

DETACHABLE POINT AND FASTENING FOR GRAIN-DRILL TEETH.

SPECIFICATION forming part of Letters Patent No. 225,674, dated March 16, 1880.-

Application filed February 19, 1880.

To all whom it may concern:

Be it known that I, WM. H. WILSON, of Xenia, in the county of Greene and State of Ohio, have invented a new and Improved Detachable Point and Fastening for GraiuDrill Teeth; and I do hereby declare that the following is a full, clear, and exact description of the same.

The object of my invention is to provide an improvement in the class of grain-drills or seeders whose drill tubes have detachable points or hoes.

The improvement consists in constructing the point or hoe proper with atubular shank, and in securing it to a drill-tube by a wedge or other suitable fastening, as hereinafter described.

In accompanying drawings, forming part of this specification, Figure l is a perspective side view of a portion of a drill-tube and my improved point attached thereto. Fig. 2 is a similar perspective of the same parts separated or detached one from the other. Fig. 3 is a sectional view, showing a modification of the fastening or means for securing the drillpoint to the tube.

The steel drill-point A is constructed with the tubular shank a, which surrounds the reduced end I) of the drill-tube 0 when applied thereto, as shown in Fig. 1. In other words, the upper portion of point A has the form of a continuous band, a, which fits somewhat closely on the end I) of the drill-tube O, and abuts against the shoulder d of the same, so that the point A is prevented from sliding upward.

In Figs. 1 and 2 the point A is shown secured to the tube 0 by means of a wedge, D, which is inserted between the narrow portion of the band a and the upwardly-inclined surface of the boss or thickened portion 0 of said tube.

In order to prevent accidental displacement of the wedge D, a small wire key, f, is insorted in a transverse hole formed by coincident grooves on the contact sides of the wedge D and drill-tube O. Said boss emay be made in one piece with the tube or separately attached thereto by rivets.

A modified form of fastening is shown in Fig. 3, in which a wedge, E, is shown inserted in a vanishing groove, g, formed in the reduced end of the drill-tube. The depth of said groove decreases from the upper end downward, so that the wedging action is the same as in the fastening shown in Figs. 1 and 2, since the wedge tends to crowd downward, and thereby increases the friction of the contact surfaces with each other. I may, however, dispense with the wedge and employ a Wire or other device having parallel sides.

I also propose in some cases to employ a Wedge or key whose point is flexible, so that it may be turned up to prevent detachment. A clamp-screw will also secure the point A firmly yet detachably.

A point constructed as shown and above described may be furnished cheaply, is adapted to be firmly secured on the drill-tube, and may be easily and quickly attached or detached, as occasion may require.

What I claim is- 1. A detachable point or hoe for drill-tubes having a solid tubular shank, a, as shown and described.

2. The combination, with a drill-tube having a shouldered end, as shown, of a point, A, having a tubular shank adapted to fit thereon, and a fastening device, as shown and described.

3. The combination of the point A, having the band or tubular shank a, and a key or fastening device, with the drill tube 0, having the inclined surface, with which said key has a \vedging action, as shown and described.

4. The combination of the point A, having tubular shank a, and a key or fastening device, with the drill-tube having a vanishing groove, as shown and described.

W. H. WILSON.

Witnesses:

SoLoN C. KEMoN, CHAS. A. PETTIT. 

